Novel peptide FxCy2 disrupts *Helicobacter pylori* metabolism and gene expression, revealing multifaceted antibacterial mechanisms.

The global challenge of antibiotic resistance significantly hampers the effective eradication of Helicobacter pylori (H. pylori) infections, leading to persistent gastric issues and increased risk of gastric cancer. Current standard-of-care therapies often result in gut microbiota dysbiosis and declining eradication rates. Antimicrobial peptides (AMPs) offer a promising alternative due to their diverse mechanisms of action, which can circumvent traditional resistance pathways, and their generally favorable side-effect profiles. Understanding the precise molecular mechanisms of novel AMPs like FxCy2 is crucial for developing next-generation anti-H. pylori treatments.

Researchers employed an integrated approach combining transcriptomic and metabolomic analyses to elucidate the antibacterial mechanisms of the novel peptide FxCy2 against Helicobacter pylori. The study utilized advanced sequencing and mass spectrometry techniques to profile changes in bacterial gene expression and metabolic pathways following FxCy2 exposure. This comprehensive methodology aimed to identify key cellular processes disrupted by the peptide, providing insights into its multifaceted antimicrobial action. The investigation built upon previous work where FxCy2 was initially identified as a potent AMP.

Integrated transcriptomic and metabolomic analyses revealed that FxCy2 exerts its antibacterial effects on H. pylori through multiple distinct pathways. The peptide significantly altered bacterial gene expression, with a notable impact on genes associated with cell wall synthesis and energy metabolism. Specifically, transcriptomic data showed differential regulation of genes involved in peptidoglycan biosynthesis and ATP production. Metabolomic profiling corroborated these findings, indicating substantial perturbations in central carbon metabolism, including glycolysis and the tricarboxylic acid (TCA) cycle. Key metabolites related to bacterial growth and survival were significantly depleted or accumulated, suggesting a disruption of metabolic homeostasis. Furthermore, FxCy2 was found to induce oxidative stress pathways, as evidenced by changes in antioxidant-related gene expression and metabolite levels. This multifaceted attack on bacterial physiology underscores FxCy2's potential.

FxCy2 profoundly altered H. pylori's metabolic landscape, disrupting both energy production and cell wall integrity pathways, indicating a broad-spectrum antimicrobial action.